A sheet conveying device includes a sheet loader, a sheet feeder, an optical sensor, and a rotary member. The sheet loader is configured to load a sheet. The sheet feeder is configured to feed the sheet loaded on the sheet loader. The optical sensor is configured to detect the sheet at a predetermined position on the sheet loader in a width direction of the sheet and at a predetermined position in a sheet conveyance passage in the width direction of the sheet. The rotary member is configured to rotate to a first position when the sheet is not at the predetermined position on the sheet loader and a second position when the sheet is at the predetermined position. The rotary member has a detection target portion configured to be detected by the optical sensor when the rotary member is located at the first or second position.

A sheet feeding device includes a sheet loading table on which a bundle of sheets is stacked, an identification mark on an end face of the sheet loading table, and an imaging unit to identify the identification mark.

In an image forming apparatus, a CPU 73 can perform a normal mode and a low mode in which a photoconductive drum 1 rotates at a rate m/n times the rotational rate in the normal mode, lower than the rotational rate in the normal mode. In the low mode, the CPU 73 causes a synchronizing signal generation portion 74 to generate a line synchronizing signal at a cycle 1/m times the cycle of the line synchronizing signal generated in the normal mode, and causes a chip data conversion portion 72 to transmit, to an exposure head 6, the same image data signal m times and transmit, to the exposure head 6, an image data signal that brings a light-emitting portion 50 into no light emission n-m times, in synchronization with n number of line synchronizing signals.

An image forming system includes: a conveyor that conveys a recording material along a conveyance path; a detector that is disposed on the conveyance path and detects a characteristic of the recording material; a fixer that fixes a toner image formed on the recording material; and a hardware processor that: causes the detector to detect the characteristic during a warm-up of the fixer with respect to an image forming job, and based on the characteristic, sets an image forming condition in the image forming job.

To provide an image forming apparatus capable of sufficiently correcting deviation of a recording material by an oscillation operation of a registration roller.

Configuring an image forming apparatus including: a conveyor that conveys a recording material; a transferer that includes a transfer roller that transfers a toner image onto the recording material; a fixer that includes a fixing roller that fixes the toner image formed on the recording material; a deviation detector that detects a position of the recording material in a conveyance intersecting direction; a deviation corrector that is located on an upstream side of the transferer and moves the recording material in the conveyance intersecting direction to correct deviation of the recording material; and a controller that controls a drive amount of the deviation corrector on the basis of a detection result of the deviation detector and the pressure contact force of a nipper nipping the recording material being conveyed.

Provided are an image forming system and a method for detecting glossiness capable of accurately detecting glossiness in various media having different conditions.

The image forming system includes a sensor unit including a light source that irradiates a medium being conveyed with light and a gloss sensor that receives light emitted from the light source and specularly reflected on the medium and detects a diffusion distribution of light in the medium, and a detection condition setting unit that identifies a type of the medium being conveyed and sets a light amount of the light source and/or exposure time of the gloss sensor at the time of glossiness detection in accordance with the type of the medium. The image forming system further includes a glossiness detector that detects glossiness of the medium from a diffusion distribution of light detected by the gloss sensor under the detection condition set by the detection condition setting unit.

A spectral property acquisition apparatus includes: a first conveying device to convey an object in predetermined conveying direction; a color data acquisition device including a plurality of spectroscopic sensors in the conveying direction, the plurality of spectroscopic sensors receive light emitted and reflected by the object to acquire color data on the object; a second conveying device to convey the color data acquisition device in a direction orthogonal to the conveying direction; and circuitry to estimate a spectral property of the object based on the color data. The circuitry controls the first conveying device so as to generate predetermined tension for the object in a color data acquisition area in which the color data on the object is acquired.

A detection device and an image forming apparatus. The detection device includes a size sensor to detect a size of a sheet in a direction of conveyance, the sheet being conveyed when detected by the size sensor, a thickness sensor to detect a thickness of the sheet, and circuitry to determine whether a disparity in sizes is occurring to the sheet or a fed-with-overlap error is occurring to the sheet, based on the thickness of the sheet detected by the thickness sensor. The image forming apparatus includes a detection device including a size sensor to detect a size of a sheet in a direction of conveyance, a thickness sensor to detect a thickness of the sheet, and circuitry to determine whether a disparity in sizes is occurring to the sheet or a fed-with-overlap error is occurring to the sheet, based on the thickness of the sheet.

When sheets having the same surface property and grammage are registered on a size basis, adjustment value registration operations need to be repeated for the respective sheets as many as these sizes. An image forming apparatus that includes a display unit and forms an image on a sheet sets a setting value of adjustment influenced by the characteristics of the image forming apparatus upon forming an image by using a sheet, and then displays a sheet list which displays a list of a plurality of types of sheets on a display unit and reflects the set setting value on at least one sheet selected from the sheet list.

An information processing apparatus includes a processor configured to: obtain characteristic values including smoothness and basis weight of a recording medium; and identify the type of the recording medium on the basis of the smoothness and the basis weight.